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Low mass companions searches using high dynamic range imaging

Published online by Cambridge University Press:  11 October 2004

C. Aime ,
R. Soummer ,
J.-L. Beuzit ,
G. Chauvin ,
X. Delfosse ,
T. Forveille ,
A.-M. Lagrange ,
L. Marchal ,
M. Mayor  and
F. Ménard
...Show all authors
J.-L. Beuzit
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, BP. 53, 38041 Grenoble, France
G. Chauvin
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Santiago, Chile
X. Delfosse
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, BP. 53, 38041 Grenoble, France
T. Forveille
Affiliation:
Canada-France-Hawaii Telescope Corporation, PO Box 1597, Kamuela HI-96743, USA
A.-M. Lagrange
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, BP. 53, 38041 Grenoble, France
L. Marchal
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, BP. 53, 38041 Grenoble, France
M. Mayor
Affiliation:
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
F. Ménard
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, BP. 53, 38041 Grenoble, France
D. Mouillet
Affiliation:
Laboratoire d'Astrophysique, Observatoire Midi-Pyrénées, BP. 826, 65008 Tarbes, France
C. Perrier
Affiliation:
Laboratoire d'Astrophysique, Observatoire de Grenoble, BP. 53, 38041 Grenoble, France
D. Ségransan
Affiliation:
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
S. Udry
Affiliation:
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
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Abstract

We present results obtained with different adaptive optics systems (ADONIS, PUEO, NAOS), in either imaging or coronagraphic modes, in the frame of several surveys aimed at searching for very low mass stars and substellar objects around nearby M dwarfs as well as in young closeby associations. For the M dwarfs of the solar neighborhood, we have obtained a very accurate mass-luminosity relation that we can compare to the prediction of recent stellar structure models. We also present multiplicity statistics of M dwarfs (binary fraction, period and mass ratio distribution), which are crucial constraints for stellar formation scenarii. We also discuss results obtained on two young closeby associations, MBM12 and Tucana-Horologium.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 12: Astronomy with High Contrast Imaging II , 2004 , pp. 319 - 336
Copyright
© EAS, EDP Sciences, 2004

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